Guided Auger Boring - Increase from Pilot Tubes to Steel Casing Diameter with Weld-On Casing Adapter

Guided Auger Boring (GAB) is a popular and cost‐effective trenchless method to accurately install steel casing for underground utilities, water lines, and sanitary sewers. The method combines pinpoint accuracy with a pilot tube installation to control line and grade and the excavation process of horizontal auger boring.
During the pilot tube installation, the soil is displaced by a slant‐bill steering head while thrust and rotation pressures are monitored in the launch shaft. Monitoring pilot tube installation data allows the contractor to probe the ground for potential obstructions. At the same time, the soil’s in‐situ properties return to their natural state if a pilot tube pull‐back is necessary.
Installed pilot tubes are connected to the steel casing pipe with a secure connection allowing the casing to follow the pilot tube path.
In soft, non-compacted ground, where the casing can be easily advanced with the thrust of the auger boring machine, a Weld-On Reaming Head (WORH) is used to increase the steel casing diameter. The arms on the WORH cut the soil into chunks, much like a cookie-cutter, which allows it to be enveloped into the casings for removal by the augers. As this process unfolds, the casing follows the line and grade established by the pilot tubes.
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